kinsfolk vs line of descent

kinsfolk and line of descent both are nouns.

Word	Noun	Adjective	Verb	Adverb
kinsfolk	Yes	No	No	No
line of descent	Yes	No	No	No

As nouns, line of descent is a hypernym of kinsfolk; that is, line of descent is a word with a broader meaning than kinsfolk:

Other hypernyms of kinsfolk include ancestry, blood, blood line, bloodline, descent, line, lineage, origin, parentage, pedigree, stemma, stock.

kinsfolk (noun)	line of descent (noun)
people descended from a common ancestor	the hereditary derivation of an individual
	the kinship relation between an individual and the individual's progenitors